/*
   Copyright (c) 2008, Adobe Systems Incorporated
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

 * Neither the name of Adobe Systems Incorporated nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package core
{

	import flash.utils.Endian;

	/**
	 * Contains reusable methods for operations pertaining
	 * to int values.
	 */
	public class IntUtil
	{

		/**
		 * Rotates x left n bits
		 *
		 * @langversion ActionScript 3.0
		 * @playerversion Flash 9.0
		 * @tiptext
		 */
		public static function rol(x : int, n : int) : int
		{
			return (x << n) | (x >>> (32 - n));
		}

		/**
		 * Rotates x right n bits
		 *
		 * @langversion ActionScript 3.0
		 * @playerversion Flash 9.0
		 * @tiptext
		 */
		public static function ror(x : int, n : int) : uint
		{
			var nn : int = 32 - n;
			return (x << nn) | (x >>> (32 - nn));
		}

		/** String for quick lookup of a hex character based on index */
		private static var hexChars : String = "0123456789abcdef";

		/**
		 * Outputs the hex value of a int, allowing the developer to specify
		 * the endinaness in the process.  Hex output is lowercase.
		 *
		 * @param n The int value to output as hex
		 * @param bigEndian Flag to output the int as big or little endian
		 * @return A string of length 8 corresponding to the
		 *		hex representation of n ( minus the leading "0x" )
		 * @langversion ActionScript 3.0
		 * @playerversion Flash 9.0
		 * @tiptext
		 */
		public static function toHex(n : int, bigEndian : Boolean = false) : String
		{
			var s : String = "";

			if(bigEndian)
			{
				for(var i : int = 0; i < 4; i++)
				{
					s += hexChars.charAt((n >> ((3 - i) * 8 + 4)) & 0xF) + hexChars.charAt((n >> ((3 - i) * 8)) & 0xF);
				}
			}
			else
			{
				for(var x : int = 0; x < 4; x++)
				{
					s += hexChars.charAt((n >> (x * 8 + 4)) & 0xF) + hexChars.charAt((n >> (x * 8)) & 0xF);
				}
			}

			return s;
		}
	}

}